如何將std :: string格式的JSON解碼爲Boost屬性樹？

Question

假設我從網絡接收到一個JSON格式的字符串，並且想要在Boost Property樹中解碼它。做這件事的最好方法是什麼？

Answer 1

爲了創建一個簡單的例子，讓我們假設我們在代碼的字符串來表示你要接收來自網絡具有以下內容的字符串：

{ 
    "Test": "string", 
    "Test2": 
    { 
     "inner0": "string2", 
     "inner1": "string3", 
     "inner2": "1234" 
    } 
} 

這樣解釋的代碼作爲一個字符串是以下情況：

#include <boost/property_tree/json_parser.hpp> 
#include <iostream> 
#include <sstream> 

int main() 
{ 
    std::stringstream buffer("{ \"Test\": \"string\", \"Test2\": { \"inner0\": \"string2\", \"inner1\": \"string3\", \"inner2\": \"1234\" } }"); 
    std::cout << buffer.str() << std::endl; 

    boost::property_tree::ptree pt; 
    boost::property_tree::json_parser::read_json(buffer, pt); 

    std::string test2_inner0_str = pt.get<std::string>("Test2.inner0"); 
    int test2_inner2_value = pt.get<int>("Test2.inner2"); 

    std::cout << test2_inner0_str << std::endl; 
    std::cout << test2_inner2_value << std::endl; 
} 

打印：

Live On Coliru

{ "Test": "string", "Test2": { "inner0": "string2", "inner1": "string3", "inner2": "1234" } } 
string2 
1234